1
|
Alirezapour F, Mohammadi M, Khanmohammadi A. Zigzag boron nitride nanotube functionalization as a sensor for the recognition of group IIA (Mg 2+, Ca 2+) metal ions, quasi-metal (Si 2+, Ge 2+) ions, and transition metal (Cu 2+, Zn 2+) ions: a computational study. J Mol Model 2024; 30:174. [PMID: 38771381 DOI: 10.1007/s00894-024-05961-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 05/02/2024] [Indexed: 05/22/2024]
Abstract
CONTEXT Boron nitride nanotubes (BNNTs) provide an exceptional and sophisticated platform for detecting metal ions with high surface area and remarkable chemical stability. Metal cations tend to bind to the surface of BNNTs, which leads to significant changes in the electrical properties of nanotubes. BNNT-based metal ion sensors have shown promising results in various applications, including water quality monitoring, biomedical research, industrial quality control, and environmental monitoring. In the present study, we have explored the electronic sensitivity of the BNNT to metal ions (Si2+, Ge2+, Cu2+, Zn2+, Mg2+, and Ca2+). The interaction between the ions with the pristine BNNT is performed in the solution phase. The results show that ion adsorption on the nanotube surface is exothermic and favorable. The density of states calculation is presented to investigate the electronic properties of the nanotube during the adsorption process. The results display that an increase in the electrical conductivity of the complexes accompanies the reduction in the energy gap. Based on the obtained data, the Si2+ and Ge2+ cations adsorbed on the BNNT with satisfactory Eg changes (%ΔE) can be promising candidates for better sensing ability. METHOD All calculations are conducted within the density functional theory (DFT) using the ωB97XD functional and 6-31G(d,p) basis set. The present approach incorporates the utilization of empirical atom-atom dispersion in conjunction with long-range correction. The calculations are performed using the quantum chemistry package GAMESS, and the obtained results are visualized by employing the GaussView 6.0.16 program.
Collapse
Affiliation(s)
- Fahimeh Alirezapour
- Department of Chemistry, Payame Noor University (PNU), P. O. Box 19395-4697, Tehran, Iran.
| | - Marziyeh Mohammadi
- Department of Chemistry, Faculty of Science, Vali-E-Asr University of Rafsanjan, Rafsanjan, Iran
| | - Azadeh Khanmohammadi
- Department of Chemistry, Payame Noor University (PNU), P. O. Box 19395-4697, Tehran, Iran
| |
Collapse
|
2
|
El-Demerdash SH, Halim SA, El-Nahas AM, El-Meligy AB. A density functional theory study of the molecular structure, reactivity, and spectroscopic properties of 2-(2-mercaptophenyl)-1-azaazulene tautomers and rotamers. Sci Rep 2023; 13:15626. [PMID: 37730839 PMCID: PMC10511447 DOI: 10.1038/s41598-023-42450-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 09/10/2023] [Indexed: 09/22/2023] Open
Abstract
Five stable tautomer and rotamers of the 2-(2-Mercaptophenyl)-1-azaazulene (thiol, thione, R1, R2, and R3) molecules were studied using density functional theory (DFT). The geometries of the studied tautomer and rotamers were fully optimized at the B3LYP/6-31G(d,p) level. Thermodynamic calculations were performed at M06-2X/6-311G++(2d,2p) and ωB97XD/6-311G++(2d,2p) in the gas phase and ethanol solution conditions modeled by the solvation model based on density (SMD). The kinetic constant of tautomer and rotamers conversion was calculated in the temperature range 270-320 K using variational transition state theory (VTST) accompanied by one-dimensional wigner tunneling correction. Energy refinement at CCSD(T)/6-311++G(2d,2p) in the gas phase has been calculated. All the studied DFT methods qualitatively give similar tautomer stability orders in the gas phase. The ethanol solvent causes some reordering of the relative stability of 2-(2-Mercaptophenyl)-1-azaazulene conformers. The transition states for the 2-(2-Mercaptophenyl)-1-azaazulene tautomerization and rotamerization processes were also determined. The reactivity, electric dipole moment, and spectroscopic properties of the studied tautomer and rotamers were computed. The hyper-Rayleigh scattering (βHRS), and depolarization ratio (DR) exhibited promising optical properties when nonlinear optical properties were calculated.
Collapse
Affiliation(s)
- Safinaz H El-Demerdash
- Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Kom, 32512, Egypt.
| | - Shimaa Abdel Halim
- Chemistry Department, Faculty of Education, Ain Shams University, Cairo, Egypt
| | - Ahmed M El-Nahas
- Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Kom, 32512, Egypt
| | - Asmaa B El-Meligy
- Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Kom, 32512, Egypt.
| |
Collapse
|
3
|
Dhariyal K, Parveen S, Kumar S, Banerjee M, Sharma P, Kumar Singh S, Singh AK. Half-Sandwich Ruthenium–Arene Thiosemicarbazones Complexes: Synthesis, Characterization, Biological Evaluation and DFT Calculations. INORG CHEM COMMUN 2023. [DOI: 10.1016/j.inoche.2023.110678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
|
4
|
Experimental spectroscopy, eco-friendly solvents effect on transitions, reactive sites and biological research on methyl gallate – MTT assay (cytotoxicity). J Mol Liq 2023. [DOI: 10.1016/j.molliq.2022.121092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
5
|
Mohamed M, Abdelakder H, Abdellah B. Microwave assisted synthesis of 4-aminophenol Schiff bases: DFT computations, QSAR/Drug-likeness proprieties and antibacterial screening. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130666] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
6
|
Yusuf TL, Akintemi EO, Olagboye S, Tolufashe GF. Investigating the biological actions of some Schiff bases using density functional theory study. PHYSICAL SCIENCES REVIEWS 2021. [DOI: 10.1515/psr-2019-0131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Schiff base ligands have wide varieties of application in several fields. One of which is the biological actions they possess such as anti-fungal, anti-bacterial, anti-malarial, and anti-viral characteristics. In this study, some synthesized phenylimino-based Schiff bases were investigated using density functional theory (DFT) to unravel their biological descriptors. The gas-phase quantum chemical calculation was done on the Schiff base 3-((E)-(phenylimino)methyl)benzene-1,2-diol and other synthesized analogues to evaluate their reactivity and stability properties including the substituent effect on the basic molecule. The Coulomb-attenuating method (CAM-B3LYP) functional was employed for the theoretical calculations. The Nuclear Magnetic Resonance (NMR), Fourier Transform-Infrared (FT-IR), Ultraviolet/visible spectroscopies calculated agrees with the experimental values. The obtained charge transfer and electronic features provide useful information regarding the active sites for biological application in the compounds.
Collapse
Affiliation(s)
- Tunde L. Yusuf
- Department of Chemistry , Ekiti State University , Ado-Ekiti , Nigeria
- Department of Chemical Science , University of Johannesburg , Johannesburg , South Africa
| | - Eric O. Akintemi
- Department of Physical Sciences , Wesley University , P.M.B. 507 , Ondo Town , Ondo State , Nigeria
| | - Sulaimon Olagboye
- Department of Chemistry , Ekiti State University , Ado-Ekiti , Nigeria
| | - Gideon F. Tolufashe
- Department of Chemistry & Biochemistry, Faculty of Sciences , University of Porto , 4169-007 Porto , Portugal
| |
Collapse
|
7
|
Murugesan A, Singh T, Rajamanikandan R, Vinu M, Ilanchelian M, Lin CH, Gengan RM. Synthesis, spectroscopic, DFT, HSA binding and docking studies of new 1,5-bis(4-chlorophenyl)-3-(2-(4-methylpiperazin-1-yl)quinolin-3-yl)pentane-1,5-dione. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129260] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
8
|
Hajji R, Hajji S, Ben Ahmed A, Nasri M, Hlel F. Synthesis, physical characterization, thermal studies, biological activities and DFT computations on the molecular structure and vibrational spectra of [C7H12N2]2Bi2Br10·4H2O compound. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
9
|
Fabrication of temperature and pH sensitive decorated magnetic nanoparticles as effective biosensors for targeted delivery of acyclovir anti-cancer drug. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113024] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
10
|
Moradian S, Dezhampanah H, Ghasemi JB, Behnejad H. Spectrophotometric-chemometrics study of the effect of solvent composition and temperature on the spectral shape and shift of copper and nickel phthalocyanines in different aqueous-nonaqueous mixed solvents. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 227:117621. [PMID: 31739196 DOI: 10.1016/j.saa.2019.117621] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/16/2019] [Accepted: 10/06/2019] [Indexed: 06/10/2023]
Abstract
Phthalocyanines (Pcs) are green-blue colored aromatic macrocyclic compounds used extensively in the dyeing industry. The assembly phenomenon for dye molecules is directly traceable by most of the spectroscopic methods. In this investigation, the monomer-dimer equilibria of copper and nickel phthalocyanines tetra sulfonic acid tetrasodium salts (CuPcTS, NiPcTS) have been investigated by spectrophotometric and chemometrics methods in binary mixtures of H2O-DMSO and H2O-CH3CN. The dimerization constants, (KD), enthalpies and entropies of CuPcTS and NiPcTS have been calculated by studying the UV-Vis spectra at different concentrations of dyes (10-6 to 10-4molL) and in the temperature range 298-343 K and in some samples up to 353 K by multivariate curve resolution (mcr) methods. By increasing the temperature, the value of KD decreases. The inverse temperature dependence of KD (van't Hoff equation) was used for determination of ΔH 0 and ΔS 0and following that ΔG 0of the dimerization reactions. As a result, upon aggregation, an increase in the intensity of the new shoulder at (~600 nm) and the Q-band at (662-670 nm) and concomitant decrease of the dimer band at (630-624 nm) are observed for all of the samples in different solvents composition. Therefore, the H-dimer type of these pigments was notable, in studied binary solvents. The effect of the solvent composition, concentration dye, and temperature on the spectral responses, the exciton parameters and concentration distribution diagrams of the two pigments were studied and discussed. The density functional theory (DFT) calculations were done in the aqueous and gas phase that they were included the HOMO-LUMO energies and the simulated UV-Vis spectrum. These calculations were beneficial for studying the UV-Vis spectrum of it in the aqueous phase for checking experimental data.
Collapse
Affiliation(s)
- Sahar Moradian
- Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran
| | - Hamid Dezhampanah
- Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran
| | - Jahan B Ghasemi
- College of Sciences, Faculty of Chemistry, University of Tehran, Tehran, Iran.
| | - Hasan Behnejad
- College of Sciences, Faculty of Chemistry, University of Tehran, Tehran, Iran
| |
Collapse
|
11
|
Khoshbin Z, Raissi H, Zaboli M. The DFT and MP2 based computational scrutiny on blue-shifted H–F stretching vibrational frequencies in hydrogen-fluoride complexes with nitriles: Insights into the decisive role of intermolecular hydrogen bonding (IMHB) in ground and electronic excited states. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2015.06.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
12
|
Hirshfeld surface analysis, vibrational spectra, optical, DFT studies and biological activities of (C7H12N2)2[SnCl6]Cl2·1.5H2O compound. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.02.045] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
13
|
Coulibaly WK, N’dri JS, Koné MGR, Dago CD, Ambeu CN, Bazureau JP, Ziao N. Studies of the Chemical Reactivity of a Series of Rhodanine Derivatives by Approaches to Quantum Chemistry. ACTA ACUST UNITED AC 2019. [DOI: 10.4236/cmb.2019.93005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
14
|
Inhibition mechanism of L,D-transpeptidase 5 in presence of the β-lactams using ONIOM method. J Mol Graph Model 2018; 87:204-210. [PMID: 30554066 DOI: 10.1016/j.jmgm.2018.11.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 11/15/2018] [Accepted: 11/21/2018] [Indexed: 02/07/2023]
Abstract
Tuberculosis (TB) is one of the world's deadliest diseases resulting from infection by the bacterium, Mycobacterium tuberculosis (M.tb). The L,D-transpeptidase enzymes catalyze the synthesis of 3 → 3 transpeptide linkages which are predominant in the peptidoglycan of the M.tb cell wall. Carbapenems is class of β-lactams that inactivate L,D-transpeptidases by acylation, although differences in antibiotic side chains modulate drug binding and acylation rates. Herein, we used a two-layered our Own N-layer integrated Molecular Mechanics ONIOM method to investigate the catalytic mechanism of L,D-transpeptidase 5 (LdtMt5) by β-lactam derivatives. LdtMt5 complexes with six β-lactams, ZINC03788344 (1), ZINC02462884 (2), ZINC03791246 (3), ZINC03808351 (4), ZINC03784242 (5) and ZINC02475683 (6) were simulated. The QM region (high-level) comprises the β-lactam, one water molecule and the Cys360 catalytic residue, while the rest of the LdtMt5 residues were treated with AMBER force field. The activation energies (ΔG#) were calculated with B3LYP, M06-2X and ωB97X density functionals with 6-311++G(2d, 2p) basis set. The ΔG# for the acylation of LdtMt5 by the selected β-lactams were obtained as 13.67, 20.90, 22.88, 24.29, 27.86 and 28.26 kcal mol-1respectively. Several of the compounds showed an improved ΔG# when compared to the previously calculated energies for imipenem and meropenem for the acylation step for LdtMt5. This model provides further validation of the catalytic inhibition mechanism of LDTs with atomistic detail.
Collapse
|
15
|
Adaikalaraj C, Manivarman S, Subashchandrabose S, Dhandapani A. Synthesis, rotational, vibrational and transitional spectra investigation on novel ethyl-4-(3-(benzo[d]1,3di-oxole-5-carboxamido)phenyl)-1,2,3,4-tetrahydro-6-methyl-2-oxopyrimidine-5-carboxylate. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.02.105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
16
|
Khorram R, Raissi H, Morsali A, Shahabi M. The computational study of the γ-Fe2O3 nanoparticle as Carmustine drug delivery system: DFT approach. J Biomol Struct Dyn 2018; 37:454-464. [DOI: 10.1080/07391102.2018.1429312] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Rabeeh Khorram
- Chemistry Department, Payame Noor University, Mashhad, Iran
| | - Heidar Raissi
- Chemistry Department, University of Birjand, Birjand, Iran
| | - Ali Morsali
- Chemistry Department, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Mahnaz Shahabi
- Chemistry Department, University of Birjand, Birjand, Iran
| |
Collapse
|
17
|
Shtukenberg AG, Zhu Q, Carter DJ, Vogt L, Hoja J, Schneider E, Song H, Pokroy B, Polishchuk I, Tkatchenko A, Oganov AR, Rohl AL, Tuckerman ME, Kahr B. Powder diffraction and crystal structure prediction identify four new coumarin polymorphs. Chem Sci 2017; 8:4926-4940. [PMID: 28959416 PMCID: PMC5607859 DOI: 10.1039/c7sc00168a] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 04/30/2017] [Indexed: 11/21/2022] Open
Abstract
Coumarin, a simple, commodity chemical isolated from beans in 1820, has, to date, only yielded one solid state structure. Here, we report a rich polymorphism of coumarin grown from the melt. Four new metastable forms were identified and their crystal structures were solved using a combination of computational crystal structure prediction algorithms and X-ray powder diffraction. With five crystal structures, coumarin has become one of the few rigid molecules showing extensive polymorphism at ambient conditions. We demonstrate the crucial role of advanced electronic structure calculations including many-body dispersion effects for accurate ranking of the stability of coumarin polymorphs and the need to account for anharmonic vibrational contributions to their free energy. As such, coumarin is a model system for studying weak intermolecular interactions, crystallization mechanisms, and kinetic effects.
Collapse
Affiliation(s)
- Alexander G Shtukenberg
- Department of Chemistry , Molecular Design Institute , New York University , New York City , NY 10003 , USA .
| | - Qiang Zhu
- Department of Physics and Astronomy , High Pressure Science and Engineering Center , University of Nevada Las Vegas , Nevada 89154 , USA .
- Department of Geosciences , Stony Brook University , Stony Brook , NY 11794 , USA
| | - Damien J Carter
- Curtin Institute for Computation and Department of Chemistry , Curtin University , P.O. Box U1987 , Perth , 6845 , Western Australia , Australia
| | - Leslie Vogt
- Department of Chemistry , New York University , New York City , NY 10003 , USA
| | - Johannes Hoja
- Fritz-Haber-Institut der Max-Planck-Gesellschaft , Faradayweg 4-6 , Berlin , 14195 , Germany
- Physics and Materials Science Research Unit , University of Luxembourg , 1511 Luxembourg , Luxembourg
| | - Elia Schneider
- Department of Chemistry , New York University , New York City , NY 10003 , USA
| | - Hongxing Song
- Department of Chemistry , New York University , New York City , NY 10003 , USA
| | - Boaz Pokroy
- Department of Materials Science and Engineering , Russell Berrie Nanotechnology Institute , Technion Israel Institute of Technology , Haifa 32000 , Israel
| | - Iryna Polishchuk
- Department of Materials Science and Engineering , Russell Berrie Nanotechnology Institute , Technion Israel Institute of Technology , Haifa 32000 , Israel
| | - Alexandre Tkatchenko
- Fritz-Haber-Institut der Max-Planck-Gesellschaft , Faradayweg 4-6 , Berlin , 14195 , Germany
- Physics and Materials Science Research Unit , University of Luxembourg , 1511 Luxembourg , Luxembourg
| | - Artem R Oganov
- Skolkovo Institute of Science and Technology , Skolkovo Innovation Center , 3 Nobel St. , Moscow 143026 , Russia
- Department of Geosciences , Stony Brook University , Stony Brook , NY 11794 , USA
| | - Andrew L Rohl
- Curtin Institute for Computation and Department of Chemistry , Curtin University , P.O. Box U1987 , Perth , 6845 , Western Australia , Australia
| | - Mark E Tuckerman
- Department of Chemistry , New York University , New York City , NY 10003 , USA
- Courant Institute of Mathematical Sciences , New York University , New York City , NY 10003 , USA
- New York University-East China Normal University Center for Computational Chemistry at NYU Shanghai , 3663 Zhongshan Road North , Shanghai 200062 , China
| | - Bart Kahr
- Department of Chemistry , Molecular Design Institute , New York University , New York City , NY 10003 , USA .
- Department of Advanced Science and Engineering (TWIns) , Waseda University , Wakamatsucho, 3-2 , Shinjuku , 162-0056 Tokyo , Japan
| |
Collapse
|
18
|
Gan Y, Yue L, Guo X, Zhu C, Cao Z. Multi-state nonadiabatic deactivation mechanism of coumarin revealed by ab initio on-the-fly trajectory surface hopping dynamic simulation. Phys Chem Chem Phys 2017; 19:12094-12106. [DOI: 10.1039/c6cp08929a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An on-the-fly trajectory surface hopping dynamic simulation has been performed for revealing the multi-state nonadiabatic deactivation mechanism of coumarin.
Collapse
Affiliation(s)
- Yanzhen Gan
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Province Key Lab of Theoretical and Computational Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- P. R. China
| | - Ling Yue
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter
- State Key Laboratory for Mechanical Behavior of Materials
- and Institute of Chemistry for New Energy Materials
- Department of Chemistry
- Faculty of Science
| | - Xugeng Guo
- Institute of Theoretical Chemistry
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- P. R. China
| | - Chaoyuan Zhu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Province Key Lab of Theoretical and Computational Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- P. R. China
| | - Zexing Cao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Province Key Lab of Theoretical and Computational Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- P. R. China
| |
Collapse
|
19
|
Kavitha T, Velraj G. Structural, spectroscopic (FT-IR, FT-Raman, NMR) and computational analysis (DOS, NBO, Fukui) of 3,5-dimethylisoxazole and 4-(chloromethyl)-3,5-dimethylisoxazole: A DFT study. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2016. [DOI: 10.1142/s0219633616500395] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The theoretical and computational analysis of two isoxazole derivatives 3,5-dimethylisoxazole and 4-chloromethyl-3,5-dimethylisoxazole were carried out along with some of the experimental evidences. The density functional theory calculations of these compounds were done with DFT/B3LYP/6-31+G(d,p) basis set using Gaussian 09 software. From the DFT calculations, the optimization geometry, vibrational analysis, electronic properties, local reactivity descriptors, natural bond orbitals, and other structural properties of the title compounds were elucidated. The chemical shifts of every C and H atom of the title compounds were calculated using Gauge Independent Atomic orbitals (GIAO) method for both proton and carbon NMR spectra. The molecular electrostatic potential of DMI has been found out and the difference in MEP on addition of chloromethyl group is also discussed. The hyperpolarizability calculations of the investigated molecules shows that the nonlinear optical activity of CDMI is greater when compared to DMI.
Collapse
Affiliation(s)
- T. Kavitha
- Department of Physics, Periyar University, Salem-636 011, Tamilnadu, India
| | - G. Velraj
- Department of Physics, Anna University, Chennai-600 025, Tamilnadu, India
| |
Collapse
|
20
|
Chidan Kumar C, Quah CK, Balachandran V, Fun HK, Asiri A, Chandraju S, Karabacak M. Synthesis, single crystal structure, spectroscopic characterization and molecular properties of (2E)-3-(2,6-dichlorophenyl)-1-(3,4-dimethoxyphenyl)prop-2-en-1-one. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.02.089] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
21
|
Kazici M, Bozar S, Yuksel SA, Ongul F, Gokce H, Gunes S, Goreci CY. Theoretical and experimental investigations of the 2-(4-chlorophenyl)-3-{[5-(2-cyano-2-phenylethenyl)]furan-2-yl}acrylonitrile molecule as a potential acceptor in organic solar cells. NANOTECHNOLOGY 2016; 27:234003. [PMID: 27145976 DOI: 10.1088/0957-4484/27/23/234003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A novel soluble asymmetric acrylonitrile derivative, 2-(4-Chlorophenyl)-3-{[5-(2-cyano-2-phenylethenyl)]furan-2-yl}acrylonitrile (CPCPFA, 3) was synthesized in three steps by Knoevenagel condensation. The structure of the CPCPFA was characterized using UV-vis, FTIR, (1)H NMR, (13)C NMR, and LC-MS. CPCPFA was evaluated as an electron acceptor in bulk heterojunction organic solar cells. Its optical and electronic properties as well as photovoltaic performance were investigated.
Collapse
Affiliation(s)
- Mehmet Kazici
- Yildiz Technical University, Faculty of Arts and Science, Department of Physics, Davutpasa Campus, 34210, Esenler, Istanbul, Turkey. Siirt University, Faculty of Arts and Science, Department of Physics, 56100, Siirt, Turkey
| | | | | | | | | | | | | |
Collapse
|
22
|
Obrai S, Kumar R, Goyal M, Kaushal S. DFT studies of calcium(II), strontium(II) and barium(II) benzoates with N,N,N′,N′-Tetrakis(2-hydroxyethyl/propyl)ethylenediamine. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.02.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
23
|
Jeyavijayan S. Molecular structure, vibrational spectra, NBO analysis, first hyperpolarizability, and HOMO–LUMO studies of 2-amino-4-hydroxypyrimidine by density functional method. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.12.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
24
|
Moorthi PP, Gunasekaran S, Swaminathan S, Ramkumaar GR. Quantum chemical density functional theory studies on the molecular structure and vibrational spectra of mannitol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 137:412-422. [PMID: 25233034 DOI: 10.1016/j.saa.2014.08.066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Revised: 08/17/2014] [Accepted: 08/23/2014] [Indexed: 06/03/2023]
Abstract
A collective experimental and theoretical study was conducted on the molecular structure and vibrational spectra of mannitol. The FT-IR and FT-Raman spectra of mannitol were recorded in the solid phase. The molecular geometry, vibrational frequencies, thermodynamic functions and atomic charges of mannitol in the ground state have been calculated by using the ab initio HF (Hartree-Fock) and density functional methods (B3LYP) invoking cc-pVDZ basis set. The complete vibrational assignments were performed on the basis of Total Energy Distribution (TED) of the vibrational modes. The UV absorption spectra of the title compound dissolved in water. Natural bond orbital analysis has been carried out to explain the charge transfer or delocalization of charge due to the intra-molecular interactions. The (1)H and (13)C nuclear magnetic resonance (NMR) chemical shifts of the molecule were calculated by GIAO methods. The first order hyperpolarizability (β0) of this novel molecular system and related properties (β, α0 and Δα) of mannitol are calculated using B3LYP/cc-pVDZ and HF/cc-pVDZ methods on the finite-field approach. By using TD-DFT calculation, electronic absorption spectra of the title compound have been predicted and a good agreement with experimental one is established. In addition, the molecular electrostatic potential (MEP) have been investigated using theoretical calculations, the calculated HOMO and LUMO energies shows that the charge transfer within the molecule.
Collapse
Affiliation(s)
- P P Moorthi
- PG and Research Department of Physics, Pachaiyappa's College, Chennai 600030, TN, India; Department of Physics, C. Kandaswami Naidu College for Men in Anna Nagar East, Chennai 600102, TN, India
| | - S Gunasekaran
- Research and Development, St. Peter's Institute of Higher Education and Research, St. Peter's University, Avadi, Chennai 600054, TN, India
| | - S Swaminathan
- Department of Textile Technology, Anna University, Chennai 600025, TN, India
| | - G R Ramkumaar
- Department of Physics, C. Kandaswami Naidu College for Men in Anna Nagar East, Chennai 600102, TN, India.
| |
Collapse
|
25
|
Elanthiraiyan M, Jayasudha B, Arivazhagan M. Molecular structure, vibrational spectroscopy, NBO and HOMO, LUMO studies of o-methoxybenzonitrile. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 134:543-552. [PMID: 25058575 DOI: 10.1016/j.saa.2014.04.103] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 04/14/2014] [Accepted: 04/22/2014] [Indexed: 06/03/2023]
Abstract
In the present study, the FT-IR and FT-Raman spectra of o-methoxybenzonitrile (O-MBN) have been recorded in the region 4000-400 cm(-1) and 3500-50 cm(-1), respectively. The fundamental modes of vibrational frequencies of O-MBN are assigned. Theoretical information on the optimized geometry, harmonic vibrational frequencies, infrared and Raman intensities were obtained by means of ab initio Hartree-Fock (HF) and density functional theory (DFT) gradient calculations with complete relaxation in the potential energy surface using 6-311++G(d,p) basis set. The vibrational frequencies which were determined experimentally from the spectral data are compared with those obtained theoretically from ab initio and DFT calculations. A close agreement was achieved between the observed and calculated frequencies by refinement of the scale factors. The infrared and Raman spectra were also predicted from the calculated intensities. Thermodynamic properties like entropy, heat capacity, zero point energy, have been calculated for the molecule. The predicted first hyperpolarizability also shows that the molecule might have a reasonably good non-linear optical (NLO) behavior. The calculated HOMO-LUMO energy gap reveals that charge transfer occurs within the molecule. Stability of the molecule arising from hyper conjugative interactions, charge delocalization have been analyzed using natural bond orbitals (NBO) analysis. Unambiguous vibrational assignment of all the fundamentals was made using the total energy distribution (TED).
Collapse
Affiliation(s)
- M Elanthiraiyan
- P.G and Research Department of Physics, National College, Tiruchirappalli 620001, India
| | - B Jayasudha
- P.G and Research Department of Physics, H.H. The Rajah's College, Pudukkottai 622001, India
| | - M Arivazhagan
- Department of Physics, A.A. Govt. Arts College, Musiri 621211, India.
| |
Collapse
|
26
|
Kumar R, Obrai S, Kaur Jassal A, Hundal MS. Supramolecular architectures of N,N,N′,N′-tetrakis-(2-hydroxyethyl)ethylenediamine and tris(2-hydroxyethyl)amine with La(iii) picrate. RSC Adv 2014. [DOI: 10.1039/c4ra05835f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
27
|
Arivazhagan M, Subhasini VP, Kavitha R. Density functional theory investigations on the conformational stability, molecular structure and vibrational spectra of 6-methyl-2-chromenone. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 128:527-539. [PMID: 24691367 DOI: 10.1016/j.saa.2014.02.093] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2013] [Revised: 02/12/2014] [Accepted: 02/16/2014] [Indexed: 06/03/2023]
Abstract
The Fourier-transform infrared and FT-Raman spectra of 6-methyl-2-chromenone (6M2C) was recorded in the region 4000-400 cm(-1) and 3500-50 cm(-1) respectively. Quantum chemical calculations of energies, geometrical structure and vibrational wavenumbers of 6M2C were carried out by density functional theory (DFT/B3LYP and LSDA) method with 6-311++G(d,p) basis set. The difference between the observed and scaled wavenumber values of most of the fundamentals is very small. The values of the total dipole moment (μ) and the first order hyperpolarizability (β) of the investigated compound were computed using B3LYP/6-311++G(d,p) calculations. The calculated results also show that 6M2C might have microscopic non-linear optical (NLO) behaviour with non-zero values. A detailed interpretation of infrared and Raman spectra of 6M2C is also reported. The calculated HOMO-LUMO energy gap shows that charge transfer occur within the molecule. The molecular electrostatic potential map shows that the negative potential sites are on the electronegative atoms as well as the positive potential sites are around the hydrogen atoms. The NMR spectrum is used in conjunction with other forms of spectroscopy and chemical analysis to determinate the structures of complicated organic molecules.
Collapse
Affiliation(s)
- M Arivazhagan
- Department of Physics, A.A. Government Arts College, Musiri, Tiruchirappalli 621201, TN, India.
| | - V P Subhasini
- Department of Physics, Jeppiaar Engineering College, Chennai 600119, TN, India
| | - R Kavitha
- Department of Physics, Saranathan Engineering College, Tiruchirappalli 620012, TN, India
| |
Collapse
|
28
|
Balachandran V, Lalitha S, Rajeswari S, Rastogi VK. Theoretical investigations on the molecular structure, vibrational spectra, thermodynamics, HOMO-LUMO, NBO analyses and paramagnetic susceptibility properties of p-(p-hydroxyphenoxy)benzoic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 121:575-585. [PMID: 24291435 DOI: 10.1016/j.saa.2013.11.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 11/01/2013] [Accepted: 11/05/2013] [Indexed: 06/02/2023]
Abstract
The experimental FT-IR (4000-400 cm(-1)) and FT-Raman (3500-100 cm(-1)) spectra of p-(p-hydroxyphenoxy) benzoic acid have been recorded. Quantum chemical calculations of energies, geometries, and vibrational wavenumbers of p-(p-hydroxyphenoxy) benzoic acid (PPHPBA) are carried out using HF and DFT/B3LYP methods with 6-311G (d,p) basis set. The optimized geometrical parameters obtained by B3LYP method show a good agreement with experimental data. The difference between the observed and scaled wave number values of most of the fundamentals is very small. The complete assignments were performed on the basis of the potential energy distribution (PED) of the vibrational modes calculated with scaled quantum mechanical method. The calculated HOMO and LUMO energies allow the calculation of atomic and molecular properties and they also show that charge transfer occurs in the molecule. A detailed molecular picture of PPHPBA and its intermolecular interactions were obtained from NBO analysis. The temperature dependence of various thermodynamic parameters was also studied. The paramagnetic behavior of the molecule under consideration has been investigated and the variation of paramagnetic susceptibility with temperature has been studied.
Collapse
Affiliation(s)
- V Balachandran
- Centre for Research, Department of Physics, A A Government Arts College, Musiri 621 211, India.
| | - S Lalitha
- P.G. & Research Department of Physics, Periyar EVR College (Autonomous), Tiruchirappalli 620 023, India
| | - S Rajeswari
- P.G. & Research Department of Physics, Periyar EVR College (Autonomous), Tiruchirappalli 620 023, India
| | - V K Rastogi
- RD Foundation Group of Institutions, Kadrabad, Modinagar, Ghaziabad 201 204, India
| |
Collapse
|
29
|
Paulraj EI, Muthu S. Molecular structure analysis and spectroscopic characterization of 5-ethyl-5-phenyl-1,3-diazinane-4,6-dione with experimental (FT-IR and FT-Raman) techniques and quantum chemical calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 106:310-320. [PMID: 23462668 DOI: 10.1016/j.saa.2013.01.048] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 01/16/2013] [Accepted: 01/17/2013] [Indexed: 06/01/2023]
Abstract
In this work, the FT-IR and FT-Raman spectra of 5-ethyl-5-phenyl-1,3-diazinane-4,6-dione have been recorded. The optimum molecular geometry, normal mode wavenumbers, infrared and Raman intensities, Raman scattering activities, corresponding vibrational assignments and Mullikan atomic charges were investigated with the help of HF and B3LYP(DFT) methods using 6-31G(d,p) basis set. The assignments of vibrational spectra have been carried out with the help of normal co-ordinate analysis (NCA) following the scaled quantum mechanical force field (SQMFF) methodology. The stability of molecule has been analyzed by NBO analysis. The calculated HOMO and LUMO energies show that charge transfer interactions take place within the molecule. Finally, the Mulliken population analysis on atomic charges of the title compound has been calculated.
Collapse
Affiliation(s)
- E Isac Paulraj
- Manonmaniam Sundaranar University, Tirunelveli 627 012, Tamil Nadu, India.
| | | |
Collapse
|
30
|
Balachandran V, Lalitha S, Rajeswari S. Rotational isomers, density functional theory, vibrational spectroscopic studies, thermodynamic functions, NBO and HOMO-LUMO analyses of 2,6-Bis(chloromethyl)pyridine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 97:1023-1032. [PMID: 22925978 DOI: 10.1016/j.saa.2012.07.111] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 07/16/2012] [Accepted: 07/26/2012] [Indexed: 06/01/2023]
Abstract
The FT-IR and FT-Raman spectra of 2,6-Bis(chloromethyl)pyridine (BCMP) have been recorded in the regions 4000-400 cm(-1) and 3500-100 cm(-1), respectively. The total energy calculations of BCMP were tried for the possible rotational isomers. The molecular structure, geometry optimization, vibrational frequencies were obtained by the HF and density functional theory (DFT/B3LYP) method with 6-311+G(d,p) basis set for the most stable rotational isomer "R3". The harmonic frequencies were calculated and the scaled values were compared with experimental FT-IR and FT-Raman spectra. The observed and the calculated frequencies are found to be in good agreement. The calculated HOMO and LUMO energies show that charge transfer occurs in the molecule. The stability of the molecule was analyzed using NBO analysis. The thermodynamic functions (heat capacity, entropy, vibrational partition function and Gibbs energy) were obtained for the range of temperature 100 K-700 K.
Collapse
Affiliation(s)
- V Balachandran
- P.G. & Research Department of Physics, A A Government Arts College, Musiri 621 211, India.
| | | | | |
Collapse
|
31
|
Balachandran V, Lalitha S, Rajeswari S. Density functional theory, comparative vibrational spectroscopic studies, NBO, HOMO-LUMO analyses and thermodynamic functions of N-(bromomethyl)phthalimide and N-(chloromethyl)phthalimide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 91:146-157. [PMID: 22381785 DOI: 10.1016/j.saa.2012.01.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 12/27/2011] [Accepted: 01/16/2012] [Indexed: 05/31/2023]
Abstract
Quantum mechanical calculations of energies, geometries, and vibrational wavenumbers of N-(bromomethyl)phthalimide and N-(chloromethyl)phthalimide are carried out using density functional theory (DFT/B3LYP) method with 6-31G and 6-311G(d,p) basis sets. The optimized geometrical parameters obtained by B3LYP method show good agreement with experimental data. The difference between the observed and scaled wavenumber values of most of the fundamentals is very small. A detailed interpretation of the infrared and Raman spectra of N-(bromomethyl)phthalimide and N-(chloromethyl)phthalimide was also reported. The calculated HOMO and LUMO energies show that charge transfer occurs in the molecules. The thermodynamic functions of N-(bromomethyl)phthalimide and N-(chloromethyl)phthalimide have been performed at B3LYP/6-31G and B3LYP/6-311G(d,p) basis sets. The theoretical spectrograms for FT-IR and FT-Raman spectra of N-(bromomethyl)phthalimide and N-(chloromethyl)phthalimide have also been constructed.
Collapse
Affiliation(s)
- V Balachandran
- Research Department of Physics, A A Government Arts College, Musiri 621 211, India.
| | | | | |
Collapse
|
32
|
Ramoji A, Yenagi J, Tonannavar J, Jadhav VB, Kulkarni MV. Vibrational and ab initio studies of 3-acetyl-6-bromocoumarin and 3-acetyl-6-methylcoumarin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 77:1039-1047. [PMID: 20855229 DOI: 10.1016/j.saa.2010.08.070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2010] [Revised: 08/17/2010] [Accepted: 08/26/2010] [Indexed: 05/29/2023]
Abstract
Infrared absorption and Raman spectra (3500-50 cm(-1)) of 3-acetyl-6-bromocoumarin and 3-acetyl-6-methylcoumarin have been measured and interpreted, aided by electronic structure calculations at RHF and B3LYP using 6-31(d, p) basis set. It has been determined that the rotation of the acetyl group with respect to the coumarin ring results in three conformers--two trans and one cis--for each molecule, with one trans conformer being the most stable in both cases. There are significant changes in the vibrational structure as characterized by positions and intensities of certain modes in going from 3-acetyl-6-bromocoumarin to 3-acetyl-6-methylcoumarin. The carbonyl stretching mode of the pyrone ring is stable in both molecules whereas the same mode in acetyl groups is not. Ring stretching vibrations are coupled to C-H in-plane bending vibrations. Down-shifting of frequencies of methyl vibrations in acetyl group occurs vis-à-vis methyl vibrations in 3-acetyl-6-methylcoumarin. A strong Raman band at 126 cm(-1) in both molecules is structure-independent non-genuine mode, correlated to lattice vibrations in the solid phase.
Collapse
Affiliation(s)
- Anuradha Ramoji
- Institute for Physical Chemistry, Friedrich Schiller University, Jena, Germany
| | | | | | | | | |
Collapse
|
33
|
Theoretical and experimental studies of vibrational spectra and thermodynamical analysis of 3′-bromopropiophenone and 4′-bromo-3-chloropropiophenone. J Mol Model 2010; 17:1587-98. [DOI: 10.1007/s00894-010-0863-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2010] [Accepted: 09/27/2010] [Indexed: 11/27/2022]
|
34
|
Tonannavar J, Yenagi J, Sortur V, Jadhav VB, Kulkarni MV. Vibrational spectra, normal modes, ab initio and DFT calculations for 6-Chloro- and 7-Chloro-4-bromomethylcoumarins. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 77:351-358. [PMID: 20638328 DOI: 10.1016/j.saa.2010.03.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2009] [Revised: 03/08/2010] [Accepted: 03/15/2010] [Indexed: 05/29/2023]
Abstract
Vibration spectral measurements - Infrared (4000-400 cm(-1)) and Raman (3500-50 cm(-1)) spectra - have been made for the solid samples of 6-Chloro- and 7-Chloro-4-bromomethylcoumarins. Ground electronic state energies, equilibrium geometries, harmonic vibrational spectra and normal modes have been computed using ab initio - RHF/6-31G* - and DFT - B3LYP/6-31G* levels of theory. The optimization yielded three structures for each molecule, with one being a transition state structure. Of the remaining two conformers, one belongs to C(s) symmetry and the other belongs to C(1), the latter being the most stable one. The optimized dihedral angle for -CH(2)Br group is 111 degrees in agreement with X-ray diffraction results reported for the similar molecular systems. Assignment of all the observed spectral bands has been proposed. The absorptions show band pattern revealing isomer characteristics and vibrational coupling in varying degrees; the Raman spectra show structural changes associated with the rings as well as lattice modes.
Collapse
Affiliation(s)
- J Tonannavar
- Department of Physics, Karnatak University, Dharwad 580003, India.
| | | | | | | | | |
Collapse
|
35
|
Murakami M, Ohkubo K, Nanjo T, Souma K, Suzuki N, Fukuzumi S. Photoinduced Electron Transfer in Photorobust Coumarins Linked with Electron Donors Affording Long Lifetimes of Triplet Charge-Separated States. Chemphyschem 2010; 11:2594-605. [DOI: 10.1002/cphc.201000096] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
36
|
Sıdır İ, Sıdır YG, Kumalar M, Taşal E. Ab initio Hartree–Fock and density functional theory investigations on the conformational stability, molecular structure and vibrational spectra of 7-acetoxy-6-(2,3-dibromopropyl)-4,8-dimethylcoumarin molecule. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2009.11.023] [Citation(s) in RCA: 150] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
37
|
Udhayakala P, Seshadri S, Rajendiran TV, Gunasekaran S. Vibrational spectroscopy investigation using ab initio and density functional theory on 3'-chloropropiophenone and 3'-nitropropiophenone. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 75:567-573. [PMID: 20031481 DOI: 10.1016/j.saa.2009.11.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 11/06/2009] [Accepted: 11/10/2009] [Indexed: 05/28/2023]
Abstract
The FTIR and FT Raman spectra of 3'-chloropropiophenone and 3'-nitropropiophenone have been recorded in the regions 4000-400 and 3500-100 cm(-1) respectively. The optimized geometry, frequency and intensity of the vibrational bands of 3'-chloropropiophenone and 3'-nitropropiophenone were obtained by ab initio and DFT levels of theory with complete relaxation in the potential energy surface using 6-31G (d,p) basis set. A complete vibrational assignment aided by the theoretical harmonic frequency analysis has been proposed. The harmonic vibrational frequencies calculated have been compared with experimental FTIR and FT Raman spectra. The observed and the calculated frequencies are found to be in good agreement. The experimental spectra also coincide satisfactorily with those of theoretically constructed simulated spectrograms.
Collapse
Affiliation(s)
- P Udhayakala
- Department of Chemistry, Pachaiyappa's College, Chennai 600 030, India
| | | | | | | |
Collapse
|
38
|
Sortur V, Yenagi J, Tonannavar J, Jadhav VB, Kulkarni MV. Vibrational assignments for 7-methyl-4-bromomethylcoumarin, as aided by RHF and B3LYP/6-31G* calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:688-694. [PMID: 18329952 DOI: 10.1016/j.saa.2008.01.016] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2007] [Revised: 01/07/2008] [Accepted: 01/12/2008] [Indexed: 05/26/2023]
Abstract
Infrared (4000-400 cm(-1)) and Raman (3500-50 cm(-1)) spectral measurements have been made for the solid sample of 7-methyl-4-bromomethylcoumarin. Electronic structure calculations at RHF/6-31G* and B3LYP/6-31G* levels of theory have been performed, giving equilibrium geometries, harmonic vibrational spectra and normal modes. Different orientations of bromomethyl group have yielded only two conformers, of which the most stable one lying lower from the other conformer by approximately 7.99 kJ/mol, is non-planar with no symmetry. A complete assignment of the vibrational modes, aided by the calculations, has been proposed. Coupled vibrations are manifest in many modes. Some spectral features, compared to 6-methyl-4-bromomethylcoumarin, show changes across both IR and Raman spectra, involving mainly skeletal vibrations, and to a lesser degree, methyl and bromomethyl vibrations. Low-frequency vibrations below 150 cm(-1) are assigned to lattice modes.
Collapse
Affiliation(s)
- Veenasangeeta Sortur
- Department of Chemistry, Karnatak University, Pavate Nagar, Dharwad 580003, India
| | | | | | | | | |
Collapse
|
39
|
Gunasekaran S, Seshadri S, Muthu S, Kumaresan S, Arunbalaji R. Vibrational spectroscopy investigation using ab initio and density functional theory on p-anisaldehyde. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 70:550-6. [PMID: 17870655 DOI: 10.1016/j.saa.2007.07.050] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2007] [Revised: 07/27/2007] [Accepted: 07/31/2007] [Indexed: 05/17/2023]
Abstract
The FTIR and FT Raman spectra of p-anisaldehyde has been recorded in the regions 4,000-400 and 3,500-100 cm(-1), respectively. The optimized geometry, frequency and intensity of the vibrational bands of p-anisaldehyde were obtained by ab initio and DFT levels of theory with complete relaxation in the potential energy surface using 6-31G(d,p) basis set. A complete vibrational assignment aided by the theoretical harmonic frequency analysis has been proposed. The harmonic vibrational frequencies calculated have been compared with experimental FTIR and FT Raman spectra. The observed and the calculated frequencies are found to be in good agreement. The experimental spectra also coincide satisfactorily with those of theoretically constructed bar type spectrograms.
Collapse
Affiliation(s)
- S Gunasekaran
- Department of Physics, Pachaiyappa's college, Chennai 600030, India
| | | | | | | | | |
Collapse
|
40
|
Ramoji A, Yenagi J, Tonannavar J, Jadhav VB, Kulkarni MV. Vibrational assignments and electronic structure calculations for 3-acetylcoumarin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 68:504-9. [PMID: 17329161 DOI: 10.1016/j.saa.2006.12.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2006] [Revised: 12/10/2006] [Accepted: 12/16/2006] [Indexed: 05/14/2023]
Abstract
Laser Raman (3500-50 cm(-1)) and IR (4000-400 cm(-1)) spectral measurements have been made on the laboratory prepared solid 3-acetylcoumarin. Molecular electronic energy, equilibrium geometrical structure and harmonic vibrational spectra have been computed at the RHF/6-31G(d,p) and B3LYP/6-31G(d,p) levels of theory. A complete vibrational assignment aided by the theoretical harmonic frequency analysis has been proposed. The B3LYP/6-31G(d,p) geometrical parameters, and frequencies of the C=O in the pyrone and acetyl group are in good agreement with experiment. The difference in the frequencies due to the two carbonyl groups, 50 cm(-1), which is attributed to the conjugation effect, is accounted for by the B3LYP to be 56cm(-1).
Collapse
|
41
|
Kuş N, Breda S, Reva I, Tasal E, Ogretir C, Fausto R. FTIR Spectroscopic and Theoretical Study of the Photochemistry of Matrix-isolated Coumarin. Photochem Photobiol 2007; 83:1237-53. [PMID: 17880520 DOI: 10.1111/j.1751-1097.2007.00152.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The infrared spectrum of monomeric unsubstituted coumarin (C9H6O2; 2H-1-benzopyran-2-one), isolated in solid argon at 10 K is presented and assigned. The UV-induced (lambda>200 nm) unimolecular photochemistry of the matrix-isolated compound was studied experimentally. Three main photoreactions were observed: (a) decarboxylation of the compound and formation of benzocyclobutadiene and CO2, with the Dewar form of coumarin as intermediate; (b) isomerization of the compound, leading to production of a conjugated ketene; and (c) decarbonylation, leading to formation of CO and benzofuran complex. Further decomposition of benzofuran to produce ethynol is suggested. Photochannels (a) and (b) correspond to those previously observed for matrix-isolated alpha-pyrone and its sulfur analogs (Phys. Chem. Chem. Phys. 2004, 6, 929; J. Phys. Chem. A 2006, 110, 6415), while route (c) is similar to the UV-induced photochemistry of coumarin in the gaseous phase (J. Phys. Chem. A 2000, 104, 1095). Interpretation of the experimental data is supported by extensive calculations performed at the B3LYP/6-311++G(d,p), MP2/6-31G(d,p) and MP2/6-311++G(d,p) levels.
Collapse
Affiliation(s)
- Nihal Kuş
- Department of Chemistry, University of Coimbra, Coimbra, Portugal
| | | | | | | | | | | |
Collapse
|
42
|
Structure and Reactivity of Organic Intermediates as Revealed by Time-Resolved Infrared Spectroscopy. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/9780470133576.ch2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
|
43
|
Sortur V, Yenagi J, Tonannavar J, Jadhav VB, Kulkarni MV. Fourier transform-infrared and Raman spectra, ab initio calculations and assignments for 6-methyl-4-bromomethylcoumarin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 64:301-7. [PMID: 16644266 DOI: 10.1016/j.saa.2005.07.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2005] [Revised: 07/06/2005] [Accepted: 07/09/2005] [Indexed: 05/08/2023]
Abstract
Fourier transform-infrared (4000-400 cm-1) and Raman (3500-50 cm-1) spectral measurements have been made for 6-methyl-4-bromomethylcoumarin. Equilibrium structures, harmonic vibrational frequencies, infrared intensities, and depolarization ratios have been computed at RHF/6-31G* and B3LYP/6-31G* levels of theory. Twisting CH2Br moiety in the geometry optimization leads to the most stable conformer lacking symmetry (C1). This is reflected in the richness of bands in the experimental spectra. A complete assignments of the bands, aided by the ab initio calculations, has been proposed for the 6-methyl-4-bromomethylcoumarin. Due to lack of symmetry, several normal vibrations have been found to be mixed ones.
Collapse
|
44
|
Using experimental studies and theoretical calculations to analyze the molecular mechanism of coumarin, p-hydroxybenzoic acid, and cinnamic acid. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2005.02.009] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
45
|
Burdzinski G, Buntinx G, Poizat O, Lapouge C. Time-resolved resonance Raman investigation and ab initio calculations of the T1-state structure of thiocoumarin. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2004.10.079] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
46
|
Hsieh TJ, Lu LH, Su CC. NMR spectroscopic, mass spectroscopic, X-ray crystallographic, and theoretical studies of molecular mechanics of natural products: farformolide B and sesamin. Biophys Chem 2004; 114:13-20. [PMID: 15792856 DOI: 10.1016/j.bpc.2004.10.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2004] [Revised: 10/05/2004] [Accepted: 10/05/2004] [Indexed: 10/26/2022]
Abstract
Two natural products, farformolide B and sesamin were isolated from Farfugium japonicum and Cinnamomum kanehirae, respectively. The structures of the two natural products, including their relative stereochemistry, were elucidated using spectroscopic data and theoretical calculations. The molecule 1 (farformolide B) is newly recognized by X-ray crystallography. The two compounds were also investigated by a theoretical analysis using the B3LYP/6-31G* method of the Gaussian 03 package program. The theoretical results were supplemented by experimental data to determine the optimal geometric structures of the two compounds. The calculated molecular mechanics were found to compare well with the experimental data. Several important thermodynamic properties of the two products, including ionization potentials, highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies, energy gaps, heat of formation, atomization energies, and vibration frequencies, were also calculated. The study also provided a good understanding of the stereochemical structure and thermodynamic properties of the two molecules.
Collapse
Affiliation(s)
- Tiane-Jye Hsieh
- Basic Medical Science Education Center, The Fooyin University, Ta-Liao, Kaohuing, Taiwan 831, R. O. C
| | | | | |
Collapse
|
47
|
Wolff T, Görner H. Photodimerization of coumarin revisited: Effects of solvent polarity on the triplet reactivity and product pattern. Phys Chem Chem Phys 2004. [DOI: 10.1039/b312335a] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
48
|
Akai N, Negishi D, Kudoh S, Takayanagi M, Nakata M. Infrared spectrum and molecular structure of lowest electronically excited triplet state of 1,4-dicyano-2,3,5,6-tetrafluorobenzene in low-temperature matrices. J Mol Struct 2004. [DOI: 10.1016/j.molstruc.2003.10.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
49
|
Akai N, Miura I, Kudoh S, Shigehara K, Nakata M. Lowest Electronically Excited Triplet States of 1,2,4,5-Tetracyanobenzene and Tetracyanopyrazine by Matrix-Isolation Infrared Spectroscopy Combined with a Density-Functional-Theory Calculation. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2003. [DOI: 10.1246/bcsj.76.1927] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
50
|
Vogel E, Gbureck A, Kiefer W. Vibrational spectroscopic studies on the dyes cresyl violet and coumarin 152. J Mol Struct 2000. [DOI: 10.1016/s0022-2860(00)00385-9] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|